HP ZBook 15 Specifications download pdf (Page 2)

Technical white paper | HP ZBook 15 G2 Mobile Workstation

OS/PXE Boot

HP ZBook 15 G2 Mobile Workstation users may encounter diculties loading a

Windows 7 image onto a system that is pre-loaded with Windows 8. This

problem stems from a system conict in the preboot execution environment

(PXE, often pronounced ‘pixie’): Windows 7 does not support Secure Boot, a

UEFI BIOS feature enabled in Windows 8 systems. When Windows 7 is loaded

on a Windows 8 system, the Secure Boot rmware blocks the launch of the OS.

Secure Boot overview

Secure Boot is a feature to ensure that only authenticated code can start on a platform. The rmware is responsible

for preventing launch of an untrusted OS by verifying the publisher of the OS loader based on policy, and is designed to

mitigate root kit attacks.

Figure 1. UEFI Secure Boot ow

Native

UEFI

Veried OS

loader

(e.g. Win8)

OS start

• Firmware enforces policy and only starts signed OS loaders it trusts.

• OS loader enforces signature verication of later OS components.

• The UEFI BIOS checks the signature of the OS loader before loading. If the signature is not valid, the UEFI BIOS will stop

the platform boot.

BIOS and UEFI background

As computer technology has advanced, the BIOS has expanded to handle new components, larger and more complex

chipsets, add-in cards, and other enhancements. This expansion has made the BIOS increasingly intricate. Development

of the Unied Extensible Firmware Interface (UEFI) is the computer industry’s solution to BIOS limitations. UEFI is a set of

modular interfaces that replaces the set of traditional BIOS interfaces between the OS and platform rmware.

UEFI is derived from high-level C language and is driver-based, scalable, and easy to debug and upgrade. UEFI uses a

modular, platform-independent architecture that can perform boot and other BIOS functions. For more information

about UEFI, go to hp.com/go/techcenter.

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HP ZBook 15 Specifications Page 2